org.apache.commons.collections.functors
Class MapTransformer

java.lang.Object
  |
  +--org.apache.commons.collections.functors.MapTransformer

All Implemented Interfaces:

Serializable, Transformer

public final class MapTransformer

extends Object

implements Transformer, Serializable

Transformer implementation that returns the value held in a specified map using the input parameter as a key.

Since:

Commons Collections 3.0

Version:

$Revision: 1.4 $ $Date: 2004/01/14 21:43:09 $

Author:

Stephen Colebourne

See Also:

Serialized Form

Method Summary

static Transformer	getInstance(Map map) Factory to create the transformer.
Object	transform(Object input) Returns the result by looking up in the map.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getInstance

public static Transformer getInstance(Map map)

Factory to create the transformer.

If the map is null, a transformer that always returns null is returned.

Parameters:

map - the map, not cloned

Returns:

the transformer

transform

public Object transform(Object input)

Returns the result by looking up in the map.

Specified by:

transform in interface Transformer

Parameters:

input - the object to be transformed

Returns:

a transformed object